On traditional Roof Garden a massive weight is added on top of the building.  Often, 1 to 1.2 tonnes are added every square meter (200~250 lb/ft²) in order to simply plant small trees, shrubs and grasses.  Once the trees, shrubs and grasses reach full maturity, their weight is further added to the building.  Lastly, the live load of people walking, running and playing in the Roof Garden must further be introduced to the buildings structure.  The Sky Garden Intensive Green Roof can support the same plants as a traditional heavy Roof Garden and is 1/8th the weight!  The G-SKY Extensive Green Roof system is 50~90% lighter than competing extensive Green Roof systems on the market.

 

Material Weights

Estimation Charts

  1. Soil
    Drainage Aggregates
    Other
  2. Retention Walls
  3. Walkways
  4. Trees
    Shrubs
    Perennials
    Sedums
    Lawn

 



 
Material Name Specific Gravity
S
o
i
l
s		 Loam (Chernozem) Soil 1.6
Sandy Loam Soil 1.8
Loam:Obsidian Perlite (7:3) 1.3
Sandy Loam:Pumice (4:6) 1.0
Roof Soil™  (Lightweight Soil) 0.8
Roof Soil™ 2 (Lightweight Soil) 0.6~0.8
A
g
g
r
e
g
a
t
e
s		 Sand (River pumped or Pit Sand) 1.7~2.1
Volcanic Rock 1.0~2.4
Expanded Slate 0.92
Black Pumice 0.79
Obsidian Perlite (*1) 0.2~0.45
Vermiculite 0.6
O
t
h
e
r		 Concrete 2.3
Bricks 1.9 (~2.4kg/brick)
Crushed Granite 2.8
Lumber 0.9~1.1
Railroad Tie 0.9~1.0 (~35kg/tie 2100 x 200 x 140mm)
(*1) Expanded Perlite can be derived from three different types of ore, Pearl Stone (Perlite), Pitch Stone and Obsidian. The most common forms of Expanded Perlite are derived from Pearl Stone or Obsidian, therefore care must be taken to ensure that Obsidian-based Perlite is chosen over Pearl or Pitch Stone-based Expanded Perlite.

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Material Name Size and Weight
Lightweight Concrete Block (1 step) Height: 200mm (8")  Depth 90mm (3-1/2")
20kg/m   (13.5lb/ft)
Lightweight Concrete Block (2 steps) Height: 400mm (16")  Depth 120mm (4-3/4")
60kg/m   (40.5lb/ft)
Bricks (3 high) Height: 210mm (8-1/4")  Depth 100mm (4")
42kg/m   (28.5lb/ft)
Bricks (5 high) Height: 350mm (13-3/4")  Depth 100mm (4")
70kg/m   (47.1lb/ft)
Railroad Tie Height: 200mm (8")  Depth 140mm (5-1/2")
28kg/m   (19lb/ft)
GR Wall GRC System Height: 150mm (6")  Depth 60mm (2-3/8")
10kg/m   (6.7lb/ft)
Height: 300mm (11-3/4")  Depth 120mm (4-3/4")
16kg/m   (10.8lb/ft)
Height: 450mm (17-3/4")  Depth 120mm (4-3/4")
21kg/m   (14.1lb/ft)

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Material Name Size and Weight
Brick Thickness: 60mm (2-3/8") 120kg/m² (24.6lb/ft²)
Tile Thickness: 10mm (3/8") 28kg/m² (5.8lb/ft²)
Thickness: 20mm (3/4") 56kg/m² (11.5lb/ft²)
Thickness: 30mm (1-3/16") 84kg/m² (17.2lb/ft²)
Thickness: 140mm (5-1/2") 140kg/m² (28.7lb/ft²)
Railroad Tie Thickness: 30mm (1-3/16") 30kg/m² (6.2lb/ft²)
Wood Deck (Hard Wood) Thickness: 140mm (5-1/2") 140kg/m² (28.7lb/ft²)
Wood Deck (Soft Wood) Thickness: 140mm (5-1/2") 20kg/m² (4.1lb/ft²)
Concrete Pavers Thickness: 30mm (1-3/16") 70kg/m² (14.4lb/ft²)
Thickness: 60mm (2-3/8") 138kg/m² (28.3lb/ft²)
Sod (Lawn) Thickness: 100mm (3-15/16") 130kg/m² (26.7lb/ft²)
Thickness: 50mm (2") 65kg/m² (13.4lb/ft²)
Thickness: 25mm (1") 33kg/m² (6.8lb/ft²)
Gravel Bed Thickness: 30mm (1-3/16") 70kg/m² (14.4lb/ft²)
Thickness: 50mm (2") 110kg/m² (22.6lb/ft²)
Volcanic Rock Bed Thickness: 50mm (2") 50kg/m² (10.3lb/ft²)
Bark Chips Thickness: 50mm (2") 30kg/m² (6.2lb/ft²)

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Tree/Plant Height Trunk Diameter Weight
4m
(13' 1/2")		 300mm
(11-3/4")		 ~266kg (586.5lb) / tree
3.5m
(11' 5-3/4")		 200mm
(7-3/4")		 ~103kg (227.1lb) / tree
3m
(9' 10-1/8")		 150mm
(5-7/8")		 ~55kg (121.3lb) / tree
2.5m
(8' 2-3/8")		 120mm
(4-3/4")		 ~35kg (77.2lb) / tree
2m
(6' 6-3/4")		 ~31kg (68.4lb) / plant
1.5m
(4' 11-1/8")		 ~27kg (59.6lb) / plant
1m
(3' 3-3/8")		 ~13kg (28.7lb) / plant
0.5m
(1' 7-5/8")		 ~6kg (13.3lb) / plant
0.3m
(11-3/4")		 ~4kg (8.8lb) / plant
200mm Perennial
(7-3/4")		 ~1.5kg (3.3lb) / plant
100mm Sedums
(3-15/16")		 ~0.2kg (0.44lb) / plant
Lawn (Uncut) 18kg/m² (3.7lb/ft²)

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